Whip roll cam arm



; une 24, 194% Junentor attorneys Patented June 24, 1941 WHIP ROLL CAMARM William Thomas OShields', Seneca, S. 0., assignor to Bahan TextileMachinery Company, Greenville, S. 0., a corporation of South CarolinaApplicationiseptember 19, 1940, Serial No. 357,413 (01. 139-115) 3Claims.

This invention relates to textile apparatus and more especially to animproved cam arm which operates the whip roll.

In weaving cloth, the warp is usually drawn upwardly from a warp beamand over the whip roll from whence it passes substantially in ahorizontal plane through conventional drop wires. The warp is thendivided into groups of ends which in turn have their respectiveharnesses. By the proper manipulation of the harnesses, sheds are formedthrough which the shuttle passes and deposits the weft yarn and therebyforms cloth.

It is a well known fact that after the weft is beat up and the shed isclosed by the harness, that the warp threads become slackened by reasonof the closing of the shed. At this time, it is desirable to take up theslack so that substantially uniform tension will be present in the warpat all times. In order to effect this result, a cam is placed on theloom crank shaft for engaging the free end of a lever arm, the other endof said arm being adapted to oscillate the whip roll up and down toapply and relieve the warp tension at the proper time.

It is an object of this invention to provide an improved whip roll camarm having a plurality of wearing surfaces on the free end thereofadapted to be placed in contact with the operating cam when necessary.Heretofore, these arms have been constructed of metal and having onlyone wearing surface. The result of such a construction has been quickwearing because of the metal-to-metal cont-act, and due to the fact thatonly one wearing surface was provided, the arm had to be discarded whenit becomes worn and a new one placed in its stead.

I propose to provide a contact member of a softer material such as wood,so as to eliminate the excessive wear and also I propose to providemeans for adjusting the contact member relative to the cam so that anumber of wearing surfaces will be available.

Some of the objects of the invention, having been stated, other objectswill appear as the description proceeds when taken in connection withthe accompanying drawing, in which-- Figure 1 is a side elevation of aportion of a loom showing my improved whip roll cam arm in an installedposition;

Figure 2 is an isometric view of the improved whip roll cam arm apartfrom the loom structure;

Figure 3 is an isometric view of a portion of the whip roll cam armshown in Figure 2, omitting the adjustable wearing member;

Figure 4 is an isometric view of the adjustable wearing member which isadapted to be placed upon the restricted portion of the whip r-oll camarm shown in Figure 3.

Referring more specifically to the drawing, the numeral denotes a sideframe of a loom having mounted therein a let-off beam II. I This beamhas warp material l2 wrapped th'erearound which emanates in sheet form[4 therefrom. The sheet of warp 14 passes upwardly over a whip roll I5and thence in a substantially horizontal direction through conventionaldrop wires [6, after which the war-p i4 is divided into layers Ma and14b. The layer Ma passes through one set of heddles l'l; whereas thelayer Mb passes through another set of heddles l8. These heddlesreciprocate up and down in a well known manner to form sheds throughwhich a shuttle, not shown, passes to deposit the weft therein.

The whip roll I5 has its ends rotatably mounted in suitable notches orgrooves in a lever 2|, and this lever, in turn, is fixedly secured on ashaft 22, which shaft is supported for oscillation by a bracket 23.Bracket23 has its lower end supported by a second bracket 24, which, inturn, is adjustably secured to the loom frame It) by any suitable meanssuch as a bolt 25 which penetrates a slot 26.

The end of the shaft 22 has an arm secured thereon by any suitable meanssuch as set screws 3|. This arm extends downwardly on an incline and thelower end thereof has integral therewith a restricted elongated bolt 32,said bolt being adapted to accommodate an elongated rectangular woodensleeve 33, which sleeve has a bore 34 therein for fitting over the bolt.Also it will be noted by referring to the drawing, that the arm 30 hasprojections 35 integral therewith which are adapted to fit in radiallydisposed slots 36 in the ends of the elongated rectangular wooden member33. When the sleeve 33 is properly installed upon the restricted bolt 32in the manner shown in Figures 1 and 2, it is seen that the projections35 prevent axial rotation of the sleeve 33 and thereby holds one facethereof in proper position for engagement with a cam 31 on a crankshaft38. Suitable washers 39 are provided on the extreme lower end of thebolt 32 and also a nut 40 is threadably secured on this bolt forconfining the sleeve in position.

When the loom is operating, the crank shaft 38 makes one revolution foreach pick. As heretofore stated, when the heddles l1 and [8 are spreadapart from each other to form a shed in the manner shown in Figure 1,there is a very much greater tension in the warp sheet I4 than will bethe case when the layers Ma and Nb are in substantially the same plane.Therefore, when the Warp sheds Ma and Mb are spread apart from eachother, it is necessary for the roller I5 to be lowered slightly so as torelieve this tension; whereas when the two sheets Ma and Nb occupysubstantially the same plane, it is desirable for the roller l5 to bemoved upwardly to prevent an excessive slack in the warp. This movementof the whip roll is effected at the proper time by means of the cam 31.

Especial attention is called to the fact that the sleeve 33 is made of asofter material than the cam 31, thereby preventing excessive wear,which always results from a metal-to-metal contact. Another decidedadvantage of a cam arm of this sort is the availability andinterchangeability of a number of Wearing surfaces. In the presentdisclosure, there are four sides upon which cam 31 can operate, andeither one of these sides can be presented to the cam merely byloosening the nut 40 and giving the sleeve a quarter-turn rotation, andthen again tightening the nut. After all four of the wearing surfaceshave been used with the sleeve in the position shown in the drawing, thenut 46 can be removed and the sleeve 33 turned end for end, and thenfour more surfaces will be available for contact with the cam. It isthus seen that a great saving has been effected, not only by providing acam arm with a wearing surface made of softer material such as wood, butalso a great saving has been provided by having the cam arm with anadjustable wearing surface so that a plurality of wearing surfaces canbe presented for contact with the rotating cam on the crank shaft.

In the drawing and specification, there has been set forth a preferredembodiment of the invention, and although specific terms are employed,they are used in a generic and descriptive sense only and not forpurposes of limitation, the scope of the invention being set forth inthe appended claims.

I claim:

1. In a loom having a whip r011 oscillatably mounted about a pivot andalso having a crank shaft with cam means thereon, a whip roll arm havingone end thereof connected to said pivot, a bolt extending from said armand a polygonal sleeve mounted on said bolt.

2. In a loom havin a whip roll oscillatably mounted about a pivot andalso having a crank shaft with cam means thereon, a whip roll arm havingone end thereof connected to said pivot, a bolt extending from said arm,a polygonal sleeve mounted on said bolt, and means for holding either ofthe faces of the sleeve in contact with said cam means.

3. In a loom having a whip roll oscillatably mounted about a pivot andalso having a crank shaft with cam means thereon, a whip roll arm havingone end thereof connected to said pivot, a bolt extending from said arm,and an elongated wooden sleeve mounted on said bolt, said sleeve havinga plurality of notches therein, a projection on said arm adapted toengage one of said notches to prevent rotation of the sleeve on thebolt.

WILLIAM THOMAS OSHIELDS.

